You can find your Windows 7 product key on the bottom of your computer (if it was bundled with Windows 7), inside the original Windows 7 package (if you purchased retail media), or in a confirmation e‑mail (if you purchased and downloaded Windows 7 online.)
You can go to the Microsoft website to see an example of a product key (certificate of authenticity or COA) stickers.
If you can't find your product key, you might need to buy a new one. To learn how, see Get a new Windows 7 product key.
If you receive an error indicating that your product key is not valid when installing Windows 7, see Windows 7 activation error: invalid product key.
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